Table 3.

Design matrix depicting actual and coded level combination and the corresponding response for a five-level, four-variable central composite rotatable designs.

Run	Actual Levels				Coded Levels				Response, Yield (%)
	X1	X2	X3	X4	X1	X2	X3	X4	Actual	Predicted
1	3	1.10	38.0	10	−1	−1	−1	−1	27.4	23.4
2	7	1.10	38.0	10	1	−1	−1	−1	45.0	41.5
3	3	2.60	38.0	10	−1	1	−1	−1	42.3	40.1
4	7	2.60	38.0	10	1	1	−1	−1	58.9	58.2
5	3	1.10	46.0	10	−1	−1	1	−1	21.5	17.6
6	7	1.10	46.0	10	1	−1	1	−1	37.5	35.7
7	3	2.60	46.0	10	−1	1	1	−1	46.8	47.7
8	7	2.60	46.0	10	1	1	1	−1	61.8	65.8
9	3	1.10	38.0	20	−1	−1	−1	1	37.9	31.5
10	7	1.10	38.0	20	1	−1	−1	1	51.3	49.6
11	3	2.60	38.0	20	−1	1	−1	1	30.1	26.4
12	7	2.60	38.0	20	1	1	−1	1	38.0	44.5
13	3	1.10	46.0	20	−1	−1	1	1	43.0	42.1
14	7	1.10	46.0	20	1	−1	1	1	59.5	60.2
15	3	2.60	46.0	20	−1	1	1	1	48.7	50.5
16	7	2.60	46.0	20	1	1	1	1	66.0	68.6
17	1	1.83	42.0	15	−2	0	0	0	20.9	35.4
18	9	1.83	42.0	15	2	0	0	0	69.4	71.6
19	5	0.33	42.0	15	0	−2	0	0	10.1	19.2
20	5	3.33	42.0	15	0	2	0	0	50.3	44.2
21	5	1.83	34.0	15	0	0	−2	0	21.5	27.9
22	5	1.83	50.0	15	0	0	2	0	49.4	46.2
23	5	1.83	42.0	5	0	0	0	−2	42.6	48.1
24	5	1.83	42.0	25	0	0	0	2	58.6	59.0
25	5	1.83	42.0	15	0	0	0	0	61.1	53.5
26	5	1.83	42.0	15	0	0	0	0	57.7	53.5
27	5	1.83	42.0	15	0	0	0	0	59.3	53.5
28	5	1.83	42.0	15	0	0	0	0	50.3	53.5
29	5	1.83	42.0	15	0	0	0	0	60.6	53.5
30	5	1.83	42.0	15	0	0	0	0	48.8	53.5